Related Clues:

• Basis
• See 53-Down
• Carrot or turnip, e.g.
• Drainage system
• Origin
• Urban alligator's home, they say
• Applaud (for)
• Herbicide's target
• Pull (out)
• Edible part of a parsnip
• Ratty place
• Underground part
• Norton's utility?
• Rats' hangout
• Carrot, e.g.